The structure and petrology of the San Jose' pluton, Northern Baja California, Mexico
Abstract
The San Jose pluton is a 117 sq km syntectonic body of chemically homogeneous biotite-hornblende tonalite in the western part of the Cretaceous Peninsular Range batholith. Contacts with lower Cretaceous volcanic and volcaniclastic wall rocks define a teardrop outline, elongate north-south. The outline of the northern 2/3 is remarkably circular and concordant to isoclinally folded, highly stretched strata. Southward the contact becomes discordant and tapers irregularly to a point. Detailed mapping revealed three texturally distinguishable lithologies emplaced in two or possibly three intrusive pulses: (1) prismatic hornblende tonalite (PHbT) partially enclosed by (2) a horseshoe-shaped shell of stubby hornblende tonalite comprise the northern 2/3 of the pluton; (3) seriate porphyritic tonalite structurally and petrographically gradiational into the PHbT forms the discordant southern wedge.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1978
- Bibcode:
- 1978PhDT........38M
- Keywords:
-
- Lower California (Mexico);
- Petrology;
- Igneous Rocks;
- Structural Properties (Geology);
- Tectonics;
- Volcanology;
- Geophysics